The 2D10.4 monoclonal antibody, also known as 2D10, specifically recognizes CD80 which is otherwise known as Activation B7-1 antigen (B7-1), B7.1, or B7. This ~60 kDa single-pass type I transmembrane glycoprotein is encoded by CD80 (CD80 molecule) that belongs to the immunoglobulin gene superfamily (IgSF). CD80 (B7-1) is comprised of an extracellular region with an IgV-like domain followed by an IgC-like domain, a transmembrane region and a cytoplasmic tail. It is variably expressed on activated B cells, activated CD4+ and CD8+ T cells, macrophages, and dendritic cells. CD80 (B7-1) serves as a ligand for the CD28 and CD152 (CTLA-4) coreceptors that are differentially expressed on T cells. CD80 (B7-1) engagement of CD28 costimulates T cells activated through their TCR-CD3 complex whereas its interaction with CD152 (CTLA-4) generates an inhibitory signal for T cell responses.
This antibody is conjugated to BD Horizon™ BV605 which is part of the BD Horizon Brilliant™ Violet family of dyes. With an Ex Max of 407-nm and Em Max of 602-nm, BD Horizon BV605 can be excited by a violet laser and detected with a standard 610/20-nm filter set. BD Horizon BV605 is a tandem fluorochrome of BD Horizon BV421 and an acceptor dye with an Em max at 605-nm. Due to the excitation of the acceptor dye by the green (532 nm) and yellow-green (561 nm) lasers, there will be significant spillover into the PE and BD Horizon PE-CF594 detectors off the green or yellow-green lasers. BD Horizon BV605 conjugates are very bright, often exhibiting brightness equivalent to PE conjugates and can be used as a third color off of the violet laser.